Question: When we first see Alan Grant, he and his team are excavating old dinosaur bones. Given that this is a time when Dinosaurs roam freely on earth, why is he even bothering? He could learn far more from simply studying a live dinosaur than its bones. And secondly, given that dinosaurs are alive and free, who is gonna have the slightest interest in bones that are millions of years old. I considered this a goof, but I'm opened to any explanations.
Answer: Agree with the other answer but would add that while to date about 1000 species of dinosaurs have been identified, it is believed there are at least 1,000 more types that existed and are still to be discovered and studied. Only a tiny fraction of the known species were cloned by In-Gen and Biosyn, and, as noted in the other answer, they are not genetically pure. Also, there is much to learn about dinosaurs' habitat, range, species evolution and decline, mating habits, health and diet, the existing climate at the time, and so on. That would be why paleontologists like Alan Grant continue digging.
Answer: The existing answers are good. In the movie, Alan Grant actually asked, "Why do we dig?" and answered his question, "Because paleontology is science [fossil animals and plants], and science is about the truth. And there is truth in these rocks." [00:20:52].
Answer: The live dinosaurs are genetically tweaked recreations, they're not the "pure" dinosaurs of the past, which would still be of great interest. Plus just like any other archaeology or historical study, there's always more to be learned about the past, and a great many people are interested in what the past has to teach us.